http://llvm.org/bugs/show_bug.cgi?id=22287

            Bug ID: 22287
           Summary: [CaptureTracking] Should be casting user as Operator,
                    not Instruction
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Global Analyses
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected], [email protected],
                    [email protected]
    Classification: Unclassified

I'm working on a project that is using capture tracking, but I'm hitting an
assert in Casting.h because I'm trying to cast a GetElementPtrConstantExpr to
an Instruction.  AFAICT, my code is valid.

The asserting cast on line 188:

 Instruction *I = cast<Instruction>(U->getUser());

I believe casting the User as an Operator would fix the issue.

 Operator *I = cast<Operator>(U->getUser());

Hopefully, someone with more experience with the Capture Tracker can create a
simple test case.  If not, I can see if I can reduce one myself.

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